3/2-5/6+7/12-9/20+11/30-13/42=()

问题描述:

3/2-5/6+7/12-9/20+11/30-13/42=()
1个回答 分类:数学 2014-12-11

问题解答:

我来补答
3/2-5/6+7/12-9/20+11/30-13/42
=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)
=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7
=1-1/7
=6/7
 
 
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